Physics
Grade-8
Easy
Question
Sound waves are ________ waves.
- No
- Mechanical
- Cylindrical
- Spherical
Hint:
Sound waves are mechanical waves.
The correct answer is: Mechanical
- Sound is a mechanical wave.
- They need a material medium for propagation.
- Their speed will be more in solids.
Related Questions to study
Physics
Compressions are the regions where the ____ is high.
- Pressure
- Volume
- Force
- Particles
Compressions are the regions where the ____ is high.
PhysicsGrade-8
- Pressure
- Volume
- Force
- Particles
Physics
Sound propagates through a medium by disturbing the ____.
- Particles of the medium
- Products of the medium
- Movement of the medium
- Stability of the medium
Sound propagates through a medium by disturbing the ____.
PhysicsGrade-8
- Particles of the medium
- Products of the medium
- Movement of the medium
- Stability of the medium
Biology
Which of the following statement is incorrect?
- A reflex action is an involuntary action.
- Reflex action requires conscious effort.
- Reflex action is a response to the peripheral nerve stimulation.
- The efferent neuron carries signals from the CNS.
Which of the following statement is incorrect?
BiologyGrade-8
- A reflex action is an involuntary action.
- Reflex action requires conscious effort.
- Reflex action is a response to the peripheral nerve stimulation.
- The efferent neuron carries signals from the CNS.
Biology
______ forms a reflex arc.
- Stimulus and response
- Organs and tissues
- Cell and cell membrane
- None of these
______ forms a reflex arc.
BiologyGrade-8
- Stimulus and response
- Organs and tissues
- Cell and cell membrane
- None of these
Biology
______ neuron functions as integrating center, located between sensory neuron and a motor neuron.
- Somatic neuron
- Interneuron
- Axon
- None of these
______ neuron functions as integrating center, located between sensory neuron and a motor neuron.
BiologyGrade-8
- Somatic neuron
- Interneuron
- Axon
- None of these
Biology
_______ is not a stimulus for reflex action.
- Sharp object
- Hot utensil
- Happiness
- Scary situation
_______ is not a stimulus for reflex action.
BiologyGrade-8
- Sharp object
- Hot utensil
- Happiness
- Scary situation
Biology
In which situation transmission of signal is electrical?
- It is always electrical
- Never
- When signal travels along with the axon
- When signal flows from one nerve cell to another nerve cell
In which situation transmission of signal is electrical?
BiologyGrade-8
- It is always electrical
- Never
- When signal travels along with the axon
- When signal flows from one nerve cell to another nerve cell
Biology
In general, afferent nerves carry sensory information
- To the central nervous system
- To the peripheral nervous system
- From the central nervous system
- From the cortex
In general, afferent nerves carry sensory information
BiologyGrade-8
- To the central nervous system
- To the peripheral nervous system
- From the central nervous system
- From the cortex
Biology
Playing guitar is an example of _________.
- Reflex
- Homeostasis
- Long term homeostasis
- Learning condition
Playing guitar is an example of _________.
BiologyGrade-8
- Reflex
- Homeostasis
- Long term homeostasis
- Learning condition
Biology
Which of the following is correct path of reflex arc?
- Brain -> muscles -> spinal cord
- Brain -> receptor -> spinal cord
- Receptor -> spinal cord -> muscles
- Muscle -> spinal cord -> brain
Which of the following is correct path of reflex arc?
BiologyGrade-8
- Brain -> muscles -> spinal cord
- Brain -> receptor -> spinal cord
- Receptor -> spinal cord -> muscles
- Muscle -> spinal cord -> brain
Biology
The brain creates connections, or pathways, between these microscopic cells
- Blood cells
- Tiny membrane
- Brain tissues
- Neurons
The brain creates connections, or pathways, between these microscopic cells
BiologyGrade-8
- Blood cells
- Tiny membrane
- Brain tissues
- Neurons
Biology
Moving of hand on touching a hot iron is ______.
- Reflex action
- Reflex stimuli
- Reflex potential
- Reflex synapse
Moving of hand on touching a hot iron is ______.
BiologyGrade-8
- Reflex action
- Reflex stimuli
- Reflex potential
- Reflex synapse
Biology
Which of the following statement is incorrect? During transmission of nerve impulses along myelinated fibers, a nerve impulse jumps from one ___________ to another.
- Myelinated sheath
- Axon
- Cell body
- Node of Ranvier
Which of the following statement is incorrect? During transmission of nerve impulses along myelinated fibers, a nerve impulse jumps from one ___________ to another.
BiologyGrade-8
- Myelinated sheath
- Axon
- Cell body
- Node of Ranvier
Biology
_______are the neurons that send an impulse from CNS to limbs and organs.
- Sensory nerves
- Afferent nerves
- Efferent nerves
- None of these
_______are the neurons that send an impulse from CNS to limbs and organs.
BiologyGrade-8
- Sensory nerves
- Afferent nerves
- Efferent nerves
- None of these
Biology
Spinal Cord originates from _____ of the brain.
- Cerebrum
- Cerebellum
- Medulla
- Pons
Spinal Cord originates from _____ of the brain.
BiologyGrade-8
- Cerebrum
- Cerebellum
- Medulla
- Pons